content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ---------------------
   * LabelChangeEvent.java
   * ---------------------
   * (C) Copyright 2013, by Michael Zinsmaier.
   *
   * Original Author:  Michael Zinsmaier;
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 17-Sep-2013 : Version 1 (MZ);
   *
   */
  
  package org.jfree.data.general;
  
  import java.util.EventObject;
  
  import org.jfree.data.extension.DatasetCursor;
  import org.jfree.data.extension.DatasetLabelExtension;
  import org.jfree.data.extension.DatasetSelectionExtension;
  
  /**
   * A change event that notifies about a change to the labeling of data items
   *
   * @author zinsmaie
   */
  public class LabelChangeEvent<CURSOR extends DatasetCursor> 
          extends EventObject {
  
      /** a generated serial id */
      private static final long serialVersionUID = 2289987249349231381L;
  
      /**
       * Constructs a new event. 
       *
       * @param source the source of the event aka the label extension that 
       *     changed (the object has to be of type DatasetLabelExtension and 
       * must not be null!)
       */
       public LabelChangeEvent(Object labelExtension) {
            super(labelExtension);
       }
  
      /**
       * @return the label selection extension that triggered the event.
       */
      public DatasetSelectionExtension<CURSOR> getLabelExtension() {
           if (this.getSource() instanceof DatasetLabelExtension) {
                return (DatasetSelectionExtension<CURSOR>) this.getSource();
           }
           //implementation error
           return null;
      }
  
  }
  